<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
<div id="app">
    <h2>{{firstName + ' ' + lastName}}</h2>
    <h2>{{firstName}} {{lastName}}</h2>

    <h2>{{getFullname()}}</h2>
    <h2>{{fullName}}</h2>
<!--  计算出来的属性不需要加小括号-->
</div>

<script src="../js/vue.js"></script>
<script>
    const vue = new Vue({
        el:'#app',
        data:{
            firstName:'Lebron',
            lastName:'James'
        },
        methods:{
            getFullname(){
              return this.firstName + ' ' + this.lastName;
            }
        },
        //computed 计算属性
        computed:{
            fullName:function(){
                return this.firstName + ' ' + this.lastName;
            }
        }

    })
</script>
</body>
</html>